摘要
通过野外调查和室内分析,对苏南某电镀厂附近旱地土壤重金属的时空变化特征及其对土壤微生物与酶活性的影响进行了研究。结果表明,研究区域土壤重金属Zn和Cu的全量与DTPA提取态含量形成明显以电镀厂为中心的扩散梯度分布,皆随距电镀厂距离的增加,浓度逐渐降低,其中Zn的全量由最高值1305mg.kg-1降至最低值273mg.kg-1。由于电镀厂重金属污染物的作用,研究样点表层土壤Zn的浓度逐年增加,土壤Zn含量明显高于前期研究结果,且都达到污染水平,最高超标4.2倍,表明近年来Zn向土壤的扩散速度较快。研究区域土壤过氧化氢酶活性与提取态Zn呈显著正相关(P=0.016),表现为激活;土壤微生物群落功能多样性及脱氢酶的活性与土壤重金属Zn的相关性不显著。因此,在研究区域微生物群落功能多样性与脱氢酶的活性不能用来指示土壤Zn污染。
Based on the field investigation and laboratory analysis,this paper studied the characteristics of soil heavy metal temporal-spatial variation,and subsequent changes of microbial and enzymatic activities in the upland surrounding an electroplating factory located in south Jiangsu Province,China.The results indicated that total and DTPA-extractable concentrations of Zn and Cu in studied soils were distributed along a gradient,and the concentration decreased as the radius from the electroplating factory increased.There was a decrease of total Zn concentration from the highes（t1 305 mg.kg-1）to the lowes（t273 mg.kg-1）.Because of effects from factory contamination,Zn concentrations in studied sites increased year by year,and the contents exceeded last results in the corresponding sites.The contents of Zn in all sites exceeded the contamination level,and the highest value of Zn in a sampling site was 4.2 times higher than its maximum allowable concentration of Zn in agricultural land,suggesting that Zn diffusion speed from the factory was high in recent years.In soils of studied area,a significant positive correlation（P = 0.016）was found between catalase activity and DTPA-extractable Zn,indicating that Zn exhibits stimulating effect on catalase activity.However,the microbial community functional diversity and dehydrogenase activity in soils were not sensitive to the levels of Zn,implying that the diversity and dehydrogenase could not serve as appropriate indicators of Zn stress in soils of the study area.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2010年第11期2133-2138,共6页
Journal of Agro-Environment Science
基金
国家重点基础研究发展规划(973)项目(2002CB410810)
中央级公益性科研院所基本科研业务专项
关键词
土壤
重金属污染
微生物功能多样性
过氧化氢酶
脱氢酶
soil
heavy metal contamination
microbial community functional diversity
catalase
dehydrogenase
